Within the RVCA’s regulated floodplain, staff have identified a number of Flood Vulnerable Areas throughout the watershed where flood events may have an impact on nearby properties. (See watershed map and table).

A series of new Neighbourhood Flood Maps for 20 vulnerable City of Ottawa communities along the Ottawa and Rideau Rivers shows the potential extent of flooding for 1:2, 1:5, 1:10, 1:20, 1:50 and 1:100 year return period floods for these neighbourhoods. 

NOTE: These maps are for informational purposes only and are not as exact as those used for regulatory purposes. 

Please note:

• The 1:2 year return period flood event has a 50% chance of occurring in any year.
• The 1:5 year return period flood event has a 20% chance of occurring in any year.
• The 1:10 year return period flood event has a 10% chance of occurring in any year.
• The 1:20 year return period flood event has a 5% chance of occurring in any year.
• The 1:50 year return period flood event has a 2% chance of occurring in any year.
• The 1:100 year return period flood event has a 1% chance of occurring in any year.

 All Rideau River Additional Flood Maps are based on recorded flow at the Rideau at Ottawa [02LA004] gauge, located at Carleton University. The two Grandview Ottawa River Additional Flood Maps are based on recorded flow at the Ottawa River at Britannia [02KF005] gauge. The Boise Village/Morin Road Additional Flood Map is based on recorded water levels at the RVCA Cumberland gauge.

DISCLAIMER:   Users of the RVCA flow data and water level data are cautioned to consider the unverified nature of the information before using it for decisions that concern personal or public safety or the conduct of business. The Rideau Valley Conservation Authority assumes no responsibility for the correctness of the information contained in this website nor liability to any user of such information, regardless of the purpose. River levels and flows can change rapidly.